Seiyuu fans have taken to ranking the most surprising pairs of characters who share the same seiyuu, with some of the more unrecognisable performances proving quite a testament to their voice acting ability…

I don't know many of her roles, but she surprised me in Gundam 00 when comparing her performance in the first season where Luise Halevy was a spoiled brat and then in the second when she went batshit-insane and killed Neena Trinity. That sent cold chills down my spine. She's awesome.

Then you didn't listen to Kikuko Inoue's darker and more evil roles. Her voice sounds totally different than that of sweet and lovely Belldandy etc., e.g. in Kiddy Grade as Alv or Claymore's Miria. Who's deaf again?

Take Taiga from ToraDora and Yuki from Saki. The characters are so different I don't feel like connecting them at all. And, boy, did that whoever it was several seconds' stand-in in Achiga-hen fell short.

Megumi Hayashibara has more range of character types and voices (Female Ranma, Eva Unit 01, Ayanami Rei, PenPen, Lina Inverse, ...), but if you're going to be surprised by Mitsuishi Kotono, be surprised by the difference between Sailor Moon and Ebichu. Yes, Ebichu. The porno hamster.